Everytime I try to open Unreal Tournament 3 or Neverwinter Nights 2 I get a blank screen. I can see my mouse and move around the screen. But I can only move it within a smaller invisible "window" within the black screen. I have to press ctrl-alt-del to get out and it gives me a message about it being non-responsive and asks me if I want to close the window. When I tell it to close the window a similar message shows up and I click close again.

In dxdiag, there are no tests available and doesn't give me any options to enable/disable dx.